/*
* Copyright (C) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup sparc64mm
* @{
*/
/** @file
*/
#include <arch/mm/as.h>
#include <arch/mm/tlb.h>
#include <genarch/mm/as_ht.h>
#include <genarch/mm/asid_fifo.h>
#include <debug.h>
#ifdef CONFIG_TSB
#include <arch/mm/tsb.h>
#include <arch/memstr.h>
#include <synch/mutex.h>
#include <arch/asm.h>
#include <mm/frame.h>
#include <bitops.h>
#include <macros.h>
#endif
/** Architecture dependent address space init. */
void as_arch_init(void)
{
as_operations = &as_ht_operations;
asid_fifo_init();
}
int as_constructor_arch(as_t *as, int flags)
{
#ifdef CONFIG_TSB
int order = fnzb32(((ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t))>>FRAME_WIDTH);
uintptr_t tsb = (uintptr_t) frame_alloc(order, flags);
if (!tsb)
return -1;
as->arch.itsb = (tsb_entry_t *) tsb;
as->arch.dtsb = (tsb_entry_t *) (tsb + ITSB_ENTRY_COUNT * sizeof(tsb_entry_t));
#endif
return 0;
}
int as_destructor_arch(as_t *as)
{
#ifdef CONFIG_TSB
count_t cnt = ((ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t))>>FRAME_WIDTH;
frame_free((uintptr_t) as->arch.itsb);
return cnt;
#else
return 0;
#endif
}
int as_create_arch(as_t *as, int flags)
{
#ifdef CONFIG_TSB
ipl_t ipl;
memsetb((uintptr_t) as->arch.itsb, (ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t), 0);
ipl = interrupts_disable();
mutex_lock_active(&as->lock); /* completely unnecessary, but polite */
tsb_invalidate(as, 0, (count_t) -1);
mutex_unlock(&as->lock);
interrupts_restore(ipl);
#endif
return 0;
}
/** Perform sparc64-specific tasks when an address space becomes active on the processor.
*
* Install ASID and map TSBs.
*
* @param as Address space.
*/
void as_install_arch(as_t *as)
{
tlb_context_reg_t ctx;
/*
* Note that we don't lock the address space.
* That's correct - we can afford it here
* because we only read members that are
* currently read-only.
*/
/*
* Write ASID to secondary context register.
* The primary context register has to be set
* from TL>0 so it will be filled from the
* secondary context register from the TL=1
* code just before switch to userspace.
*/
ctx.v = 0;
ctx.context = as->asid;
mmu_secondary_context_write(ctx.v);
#ifdef CONFIG_TSB
uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
ASSERT(as->arch.itsb && as->arch.dtsb);
uintptr_t tsb = (uintptr_t) as->arch.itsb;
if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
/*
* TSBs were allocated from memory not covered
* by the locked 4M kernel DTLB entry. We need
* to map both TSBs explicitly.
*/
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);
dtlb_insert_mapping(tsb, KA2PA(tsb), PAGESIZE_64K, true, true);
}
/*
* Setup TSB Base registers.
*/
tsb_base_reg_t tsb_base;
tsb_base.value = 0;
tsb_base.size = TSB_SIZE;
tsb_base.split = 0;
tsb_base.base = ((uintptr_t) as->arch.itsb) >> PAGE_WIDTH;
itsb_base_write(tsb_base.value);
tsb_base.base = ((uintptr_t) as->arch.dtsb) >> PAGE_WIDTH;
dtsb_base_write(tsb_base.value);
#endif
}
/** Perform sparc64-specific tasks when an address space is removed from the processor.
*
* Demap TSBs.
*
* @param as Address space.
*/
void as_deinstall_arch(as_t *as)
{
/*
* Note that we don't lock the address space.
* That's correct - we can afford it here
* because we only read members that are
* currently read-only.
*/
#ifdef CONFIG_TSB
uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
ASSERT(as->arch.itsb && as->arch.dtsb);
uintptr_t tsb = (uintptr_t) as->arch.itsb;
if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
/*
* TSBs were allocated from memory not covered
* by the locked 4M kernel DTLB entry. We need
* to demap the entry installed by as_install_arch().
*/
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);
}
#endif
}
/** @}
*/